Reply by KevinH

I found similar inserts at our local Fastenal store, but not at that low price. I don’t go there often, but they have a lot of specialty fasteners that the big box stores don’t carry. Their personnel know their products and will take the time to track down the odd set screw or what have you, even if they only sell you one.

-- Timing has a lot to do with the outcome of a rain dance. --Kevin in Happy Valley